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Since the 80 s, the construction industry of higher requirements for the comprehensive performance of sealing strip, sealing strip, of course, the industry also has a great development.
Sealing strip (1) the construction industry product structure had the very big change. Changed the original single analysing to now two composite analysing (i.e., dense rubber and dense or sponge rubber compound), three composite materials (i.e., dense skeleton rubber, sponge rubber and steel or nylon composite), four composite materials (i.e., dense rubber, sponge rubber and steel or nylon frame, flocking four composite material).
(2) the applications of the materials with the new development. Abandoned the strength, heat resistance, weather resistance and aging resistance are poor natural rubber or styrene-butadiene rubber and plastic, used the EPDM synthetic rubber (EPDM). EPDM has excellent heat resistance, weather resistance, ozone resistance, and its main physical properties are shown in table 1. Because of excellent characteristics of EPDM off sales are growing in recent decades.
(3) bid farewell to the original production process production technology, using the more advanced the nose extrusion microwave vulcanization process, secondary processing and injection molding process. Obviously, the first is also the most basic role sealing strip was sealed, need waterproof, noise and dust. In fact, the sealing effect can be obtained by improving the design to further improve. Now the material friction resistance is more and more is also high, so that the sealing performance can maintain for a longer time, initial can also reduce damage during installation. Seal as much as possible to make the car is the main purpose of isolation with the outside world, to maximise the driver and passenger comfort. It should be said that now the sealing strip in connectivity, sealing, decorative, security and other aspects have significant degree than before the 80 s, but there is a certain gap in terms of decoration, environmental protection.